Feasibility of humanoids that evolved from slugs?

I was inspired by Phylliroe molluscs which are sea slugs that have evolved into translucent fish (see image bellow).

In my story most aquatic life on earth had evolved from these translucent slugs and over millions of years some slug-fish managed to evolve into land animals and eventually into intelligent humanoids.

I'm wondering how feasible is the idea of translucent humanoid slug people and under what conditions could such beings evolve?

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Feasibility of humanoids that evolved from slugs?

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